import 'package:flutter/material.dart';
import 'package:english_words/english_words.dart';
import 'package:fluttertoast/fluttertoast.dart';
class RandomWords extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    // TODO: implement createState
    return new RandomWordsState();
  }
}

class RandomWordsState extends State<RandomWords> {
  final _suggestions = <WordPair>[];
  final _biggerFont = const TextStyle(fontSize: 18.0);

  final _saved = new Set<WordPair>();

  @override
  Widget build(BuildContext context) {
//    final wordPair = new WordPair.random();
//    return new Text(wordPair.asPascalCase);
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Startup Name Generator'),
        actions: <Widget>[
          new IconButton(icon: new Icon(Icons.list), onPressed: _pushSaved)
        ],
      ),
      body: _buildSuggestions(),
    );
  }

  void _pushSaved() {
    Navigator.of(context).push(
      new MaterialPageRoute(
        builder: (context) {
          final titles = _saved.map(
                (pair) {
              return new ListTile(
                title: new Text(
                  pair.asPascalCase,
                  style: _biggerFont,
                ),
              );
            },
          );
          final divided =
          ListTile.divideTiles(context: context, tiles: titles).toList();
          return new Scaffold(
            appBar: new AppBar(
              title: new Text('Saved Suggestions'),
            ),
            body: new ListView(
              children: divided,
            ),
          );
        },
      ),
    );
  }

  Widget _buildSuggestions() {
    return new ListView.builder(
        padding: const EdgeInsets.all(16.0),
        itemBuilder: (context, i) {
          if (i.isOdd) return new Divider();
          final index = i ~/ 2;
          if (index >= _suggestions.length) {
            _suggestions.addAll(generateWordPairs().take(10));
          }
          return _buildRow(_suggestions[index]);
        });
  }

  /// 详细解释：将所有收藏的都加入_saved，每一行触发trailing，在其中的变红，不在其中的没有颜色，在其中的再次点击取消收藏，对应onTap
  Widget _buildRow(WordPair pair) {
    final alreadySaved = _saved.contains(pair);
    return new ListTile(
      title: new Text(
        pair.asPascalCase,
        style: _biggerFont,
      ),
      trailing: new Icon(
        alreadySaved ? Icons.favorite : Icons.favorite_border,
        color: alreadySaved ? Colors.red : null,
      ),
      onTap: () {
        setState(() {
          if (alreadySaved) {
            _saved.remove(pair);
          } else {
            _saved.add(pair);
          }
        });
      },
      onLongPress: () {
        print("长按" + pair.asPascalCase);
        _jumpOther(pair.asPascalCase);
      },
    );
  }

  void _jumpOther(String param) {
    Fluttertoast.showToast(msg: param);
  }
}